JP2002260675A - Cylindrical lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical lead-acid battery for solving the problem of conventional battery, such as deformations and ruptures of a sash bar at active material filling time, and adverse effects on battery capacity, without impairing the required flexibility. SOLUTION: This cylindrical lead-acid battery is formed, by winding a belt- like positive electrode plate and a negative electrode plate via a belt-like separator, and forms a projecting strip and/or a groove in the lengthwise direction of the sash bar, positioned in the width direction of a belt-like plate grating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cylindrical lead-acid battery.

[0002]

2. Description of the Related Art As shown in FIG. 3, a cylindrical lead-acid battery has a wound power generating element 4 in which a strip-shaped positive electrode plate 1 and a strip-shaped negative electrode plate 2 are wound into a cylindrical shape via a strip-shaped separator 3. Used.
As the positive electrode plate 1 and the negative electrode plate 2, a continuous grid such as a punched grid or an expanded grid as shown in FIG. 4 is used, and a large number of grids 5a of a strip-shaped grid 5 are filled with a paste-like active material. It is. The electrode grid 5 is a strip made of a soft alloy such as pure lead or a lead-tin alloy in consideration of the winding property. This is the opening formed. The electrode grid 5 is designed to fill as much active material as possible. In this conventional example,
Ears 5b are protrudingly provided at the upper end sides, and the positive electrode plate 1 and the negative electrode plate 2 are wound so as to project from the upper end surface of the power generation element 4, so that current collection can be performed by a strap (not shown). ing.

FIG. 5 shows a grid 5 of a positive electrode plate 1 and a negative electrode plate 2.
This is an example of a step of filling the active material 6 into the paste material. The pasting paper 8 is fed to the lower surface of the strip-shaped electrode grid 5 conveyed on the conveyor 7 and the paste-like active material 6 is filled from the upper surface. I do. Thereafter, if necessary, another pasting paper 8 is supplied also to the upper surface of the electrode grid 5, so that the paste is applied to the upper and lower surfaces of the paste-like active material 6 filled in the grid and filled with grids. You can also attach.

[0004]

In a cylindrical battery, since a power generating element is manufactured by winding an electrode plate, it is necessary to use a grid which is flexible and easily deformed. For this reason, the grid is easily deformed by the pressure at the time of filling the active material, and the bar may be broken due to deformation, particularly in a grid bar that is perpendicular to or close to the moving direction of the grid during the filling of the active material. It was difficult to fill using the active material paste.

[0005] In order to eliminate lattice deformation, it is necessary to apply a soft active material paste, and the active material paste is made soft by adding an excess amount of water than usual when preparing the active material paste. With this method, the active material can be filled without deforming the lattice.However, if the proportion of water in the active material paste is increased, the amount of the active material necessary for the battery reaction is inevitably reduced. This has led to smaller capacities.

SUMMARY OF THE INVENTION The present invention has been made in order to cope with such a situation, and has a ridge or a groove formed in a longitudinal direction of a bar located in a width direction of a strip-shaped electrode grid used for a cylindrical lead-acid battery. By doing so, the flexibility required to manufacture the power generating element by winding the electrode plate is not impaired, and it is easy to receive the pressure at the time of filling the active material, in a direction perpendicular to or close to the moving direction of the grid. It is an object of the present invention to provide a cylindrical lead-acid battery in which a certain grid bar, that is, only a bar located in the width direction of a strip-shaped electrode grid is strengthened in mechanical strength to solve the problem of the conventional battery.

[0007]

According to the first aspect of the present invention,
In a cylindrical lead-acid battery formed by winding a band-shaped positive electrode plate and a negative electrode plate with a band-shaped separator interposed therebetween, ridges and / or grooves are formed in a length direction of a bar located in a width direction of a band-shaped electrode plate lattice. A cylindrical lead-acid battery characterized by the following.

[0008]

According to the first aspect of the present invention, in a cylindrical lead-acid battery in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound via a strip-shaped separator, they are located in the width direction of the strip-shaped electrode plate grid. Protrusions and grooves are formed along the length of the crosspiece. By doing so, the grid bars can be made thinner to secure the necessary flexibility and be designed to be able to fill a large amount of active material. Therefore, problems such as deformation and breakage of the crossbar when the active material is filled and an adverse effect on the battery capacity are eliminated.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention and is an enlarged view of a main part of a lead grid used in a cylindrical lead-acid battery of the present invention. Components having the same functions as those of the conventional example shown in FIGS. 3 to 5 are denoted by the same reference numerals. In the figure, reference numeral 5 denotes an electrode grid formed by punching from a strip-shaped lead sheet, 5a denotes punched squares, 5c and 5d denote vertical bars and horizontal bars formed by punching. The squares 5a have a square shape of a fixed size, and are arranged regularly at regular intervals in the vertical and horizontal directions.

FIG. 2 is an enlarged cross-sectional view of a vertical bar 5c, which is a bar located in the width direction of the strip-shaped electrode grid, and 5e is a vertical bar 5c.
The grooves 5f formed in the length direction of c are ridges. The cross-sectional shape of the crosspiece is changed from a conventional simple rectangular shape to a shape having a substantially increased thickness, so that its mechanical strength is increased. In the present embodiment, an example is shown in which the cross-sectional shape of the vertical bar 5c is formed into the simplest substantially V-shape, but ridges or grooves are formed in the length direction of the bar located in the width direction of the strip-shaped electrode plate grid. By doing so, it is not limited to the above-described embodiment as long as the substantial thickness is increased and the strength is improved.

In the above embodiment, a lead-acid battery using a wound power generating element composed of a punched grid has been described. However, the present invention is also effective when applied to a lead-acid battery using a cast grid. Also,
The bar in the width direction of the strip-shaped electrode grid is not necessarily perpendicular to the length direction, and there are some bars which are inclined. Applicable since there is almost no adverse effect.

[0013]

As is apparent from the above description, according to the present invention, the electrode plate is formed by forming ridges and grooves in the length direction of the crosspiece located in the width direction of the strip-shaped electrode plate grid. Without losing the flexibility required to make a power generation element by winding
The grid bars in the direction perpendicular or close to the moving direction of the grid, which are easily subjected to the pressure at the time of filling the active material, that is, only the bars located in the width direction of the strip-shaped electrode grid are strengthened in mechanical strength. In addition, it is possible to provide a cylindrical lead-acid battery that has solved the problems of the conventional battery.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of a lead grid used in a cylindrical lead storage battery of the present invention.

FIG. 2 is an enlarged sectional view of a vertical bar 5c in FIG.

FIG. 3 is an exploded perspective view showing the structure of a power generating element of the cylindrical battery.

FIG. 4 is a developed plan view of an electrode grid used for a positive electrode plate and a negative electrode plate.

FIG. 5 is a front view showing an example of a step of filling an active material into an electrode grid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Power generation element 5 Electrode plate grid 5a grid 5b ear 5c vertical bar 5d horizontal bar 5e groove 5f ridge 6 Active material 7 Conveyor 8 Pasting paper

Claims (1)

[Claims] 1. A cylindrical lead-acid battery in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound with a strip-shaped separator interposed therebetween. Or a cylindrical lead storage battery characterized by forming a groove.